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RFC: Prohibit use of interpolated strings in function calls without parentheses (#648)

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We've had this restriction in the original RFC, but decided to remove it afterwards. This change puts the restriction back - we need to work through some implications of future support for string-based DSLs together with interpolated strings which may or may not change the behavior here, for example to allow something like

```
local fragment = xml `
  <img src="{self.url}" />
`
```
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Arseny Kapoulkine 2022-08-25 14:54:02 -07:00 • committed by GitHub
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commit e84bccc5c0
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rfcs/syntax-string-interpolation.md
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@ -87,13 +87,15 @@ print(`Welcome to \
-- Luau!
```
This expression can also come after a `prefixexp`:
We currently *prohibit* using interpolated strings in function calls without parentheses, this is illegal:
```
local name = "world"
print`Hello {name}`
```
> Note: This restriction is likely temporary while we work through string interpolation DSLs, an ability to pass individual components of interpolated strings to a function.
The restriction on `{{` exists solely for the people coming from languages e.g. C#, Rust, or Python which uses `{{` to escape and get the character `{` at runtime. We're also rejecting this at parse time too, since the proper way to escape it is `\{`, so:
```lua